Structure of solenoid valve attached to resin cover by insert-molding

Abstract

A structure of a solenoid valve attached to a resin cover by insert-molding, the solenoid valve includes a valve body having a cylindrical shape and at least two fluid passages, a spool housed in the valve body and slidable therein in an axial direction relative to the valve body, a solenoid for actuating the spool, wherein a plurality of flanges is provided on an outer peripheral surface of the valve body, and at least one of the flanges has a through hole formed in the axial direction relative to the valve body.

The invention claimed is: 
     
       1. A structure of a solenoid valve attached to a resin cover by insert-molding, the solenoid valve comprising:
 a sleeve having a cylindrical shape and at least two fluid passages; 
 a spool housed in the sleeve and slidable therein in an axial direction relative to the sleeve; and 
 a solenoid for actuating the spool; wherein 
 a valve body is provided on an outer peripheral surface of the sleeve and has a plurality of fluid passages that is in fluid communication with the fluid passages of the sleeve, 
 a plurality of flanges is provided on an outer peripheral surface of the valve body, and at least one of the flanges has a through hole formed in the axial direction relative to the valve body, and 
 the plurality of flanges includes a first flange and a second flange positioned at opposite axial ends of the valve body, the first and second flanges being embedded in the resin cover during insert-molding of the resin cover, the first flange possessing a first through hole extending in the axial direction through the first flange, the second flange possessing a second through hole extending in the axial direction through the second flange. 
 
     
     
       2. The structure of the solenoid valve attached to the resin cover by insert-molding according to  claim 1 , wherein a material of the sleeve and a material of the valve body have substantially same thermal expansion coefficients. 
     
     
       3. The structure of the solenoid valve attached to the resin cover by insert-molding according to  claim 1 , wherein the resin cover encloses and supports at least the flanges of the valve body. 
     
     
       4. The structure of the solenoid valve attached to the resin cover by insert-molding according to  claim 3 , wherein an outer diameter of the at least one of the flanges is larger than an outer diameter of the other flanges. 
     
     
       5. The structure of the solenoid valve attached to the resin cover by insert-molding according to  claim 3 , wherein a plurality of the through holes is formed along a circumferential direction of the at least one of the flanges. 
     
     
       6. The structure of the solenoid valve attached to the resin cover by insert-molding according to  claim 5 , wherein the through hole is opened outwardly in a radial direction of the flange. 
     
     
       7. The structure of the solenoid valve attached to the resin cover by insert-molding according to  claim 1 , wherein an outer diameter of the at least one of the flanges is larger than an outer diameter of the other flanges. 
     
     
       8. The structure of the solenoid valve attached to the resin cover by insert-molding according to  claim 1 , wherein a plurality of the through holes is formed along a circumferential direction of the at least one of the flanges. 
     
     
       9. The structure of the solenoid valve attached to the resin cover by insert-molding according to  claim 8 , wherein the through hole is opened outwardly in a radial direction of the flange. 
     
     
       10. The structure of the solenoid valve attached to the resin cover by insert-molding according to  claim 1 , wherein the through hole has an oval shape in cross section. 
     
     
       11. The structure of the solenoid valve attached to the resin cover by insert-molding according to  claim 1 , wherein the through hole has a circular shape in cross section. 
     
     
       12. The structure of the solenoid valve attached to the resin cover by insert-molding according to  claim 1 , wherein the through hole has a polygon shape in cross section. 
     
     
       13. A solenoid valve configured for attachment to a resin cover by insert-molding, the solenoid valve comprising:
 a cylindrical valve body possessing opposite axial ends and two fluid passages; 
 a spool housed in the cylindrical valve body and movable relative to the cylindrical valve body in the axial direction; 
 a solenoid configured to move the spool; 
 a first flange and a second flange protruding from an outer peripheral surface of the cylindrical valve body and positioned at respective opposite axial ends of the cylindrical valve body, the first and second flanges being embedded in the resin cover during insert-molding of the resin cover; 
 a first through hole extending in the axial direction through the first flange, the first through hole being filled with a portion of the resin cover during insert-molding of the resin cover; and 
 a second through hole extending in the axial direction through the second flange, the second through hole being filled with a portion of the resin cover during insert-molding of the resin cover. 
 
     
     
       14. The solenoid valve of  claim 13 , further comprising a cylindrical sleeve positioned between the cylindrical valve body and the spool. 
     
     
       15. The solenoid valve of  claim 13 , further comprising a plurality of third and fourth flanges protruding from the outer peripheral surface of the cylindrical valve body and positioned between the first flange and the second flange, the third flanges possessing a through hole and the fourth flanges being devoid of a through hole, the third flanges and the fourth flanges being alternately arranged in the axial direction so that every other flange possesses a through hole. 
     
     
       16. A structure of a solenoid valve attached to a resin cover by insert-molding, the solenoid valve comprising:
 a sleeve having a cylindrical shape and at least two fluid passages; 
 a spool housed in the sleeve and slidable therein in an axial direction relative to the sleeve; and 
 a solenoid for actuating the spool; wherein 
 a valve body is provided on an outer peripheral surface of the sleeve and has a plurality of fluid passages that is in fluid communication with the fluid passages of the sleeve, 
 a plurality of flanges is provided on an outer peripheral surface of the valve body, and at least one of the flanges has a through hole formed in the axial direction relative to the valve body, and 
 the plurality of flanges includes first flanges possessing a through hole and second flanges devoid of a through hole, the first flanges and the second flanges being alternately arranged so that every other flange in the axial direction possesses a through hole.